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 SECTION 3.
CARBON DIOXIDE SYSTEMS
3.0 CARBON DIOXIDE SYSTEMS: New carbon dioxide systems shall not be
designed or installed in occupiable spaces or rooms. This applies to total
room flooding systems only. The use of carbon dioxide flooding systems for
spaces directly below a raised computer room floor is acceptable.
3.1 SEQUENCE OF OPERATION:
Cross zoned smoke detectors rather than
a single smoke detector with alarm verification shall be used to actuate
the system, the sequence shall be as follows (NOTE: Total room flooding is
prohibited):
a.
Upon actuation of the first detector (pre-alarm model):
(1)
A pre-discharge alarm (distinct from building general
alarm) shall sound in the protected area.
(2)
An alarm signal shall be transmitted to the Fire
Department unless otherwise authorized by
PACNAVFACENGCOM Code 408.
b.
Upon actuation of the second detector (discharge mode):
(1)
Air handling equipment serving the protected area(s)
shall shut down.
(2)
All door closers and any required dampers to the
protected area shall close.
(3)
A red revolving light in the protected area must
activate.
(4)
A general building alarm shall sound.
(5)
A time delay relay (set at a maximum 30 seconds) shall
start, at the end of the time delay the following shall
occur:
(a)
Discharge will occur in the protected area or
zone where the alarm was initiated.
(b)
Technical power in the affected area or zone shall
shutdown.
Note: Designer must consider if the particular
technical equipment requires a phased shutdown.
(c)
A visual indicator (i.e., sign with lit face
or flashing light above) outside the entrances
to the area of zone must activate, indicating
that re-entry is prohibited.
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